The sensor clearly has to be using something like the uP counter input function, you could never individually capture all the pulses otherwise. If the motor is spinning at 8,000 RPM (some do, I checked), and you have 24 stripes, you'd have 3200 stripes/second to sense, or one about every 300 microseconds. You might be able to service interrupts at that pace, but it would be consuming a significant part of the bandwidth. What I do in the Chuff-Generator is use an input pin counter trigger to count the stripes and then just react when I get to the correct count.
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